Looks like you have proprietary driver installed. Did you tried to uninstall it 
and use FOSS driver instead? (Uninstall fglrx package, remove 
/etc/X11/xorg.conf and reboot.)
You also may try to update fglrx driver 
http://wiki.cchtml.com/index.php/Ubuntu_Raring_Installation_Guide and if this 
doesn't help contact with AMD technical support: 
http://emailcustomercare.amd.com/

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https://bugs.launchpad.net/bugs/1173217

Title:
  Screen edges are in the middle of the screen! AMD Radeon HD7570M

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